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Dielectric breakdown properties of Al-air mixtures

Plasma science and technology 2021年第5期23卷 59-65页

作者： Xiyuan CAI Xiao ZHANG Junyong LU Sai TAN Yongsheng ZHANG Guanxiang ZHANG National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033People's Republic of China

In order to investigate the influence of aluminum vapor on the breakdown performance of air,this paper makes a study of the dielectric breakdown characteristics of Al-air mixture in the temperature range of 300-5000 K at atmospheric pressure.A Boltzmann analysis method is used to deal with the electron energy distribution function(EEDF),the reduced ionization coefficients(α/N),the reduced attachment coefficients(η/N)and the critical reduced breakdown strength((E/N)cr)so as to explore the influence of temperature and mixing ratio on the dielectric breakdown *** the temperature range of 300-2000 K,the property of the mixture is mainly determined by the mixing proportion of aluminum vapor because the composition of particles remains *** the temperature range of 2000-2500 K,the decomposition of Al2O_(2)leads to the increase of aluminum oxides and NO,and a rise in the percentage of highenergy electrons as well as the increment ofα/***,the joint action of O_(2)and NO makesη/N increase first and then decrease,and(E/N)crgoes down to a smaller temperature *** increase in the proportion of aluminum vapor causes(E/N)crto decrease in the low-temperature region and to increase in the high-temperature region,which will reduce the transition between these two temperature regions.

关键词： aluminum vapor arc discharges Boltzmann analysis dielectric properties electromagnetic rail launch muzzle arc

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Research on active arc-ignition technology as a possible residual-energy-release strategy in electromagnetic rail launch

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Plasma science and technology 2021年第8期23卷 167-174页

作者： Xiyuan CAI Sai TAN Junyong LU Xiao ZHANG Yun GUO National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033People's Republic of China

In order to solve the problem of the original residual energy release strategy being unsuitable for high-energy and fast-firing electromagnetic rail launch,this work has explored the applicability of active arc-ignition technology(AAT).The results obtained from the comparison of launching experiments show that AAT has no influence on the acceleration of the armature and is capable of quickly releasing the residual *** on the theory of magnetohydrodynamics,this work has also made numerical simulation of the muzzle arc,analyzed the influence of AAT on the muzzle arc flow field,electromagnetic(EM)field and temperature field,and evaluated the performance of AAT according to the projectile initial disturbance,the EM impact on guidance devices and the rail *** results show that AAT is now one of the most practicable strategies for residual energy release.

关键词： muzzle arc initial disturbance guidance device arc ablation backflow

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A High Step-down DC-DC Converter with Matrix-Transformer and Wide Voltage Gain for Vehicle power Supply Applications 22

A High Step-down DC-DC Converter with Matrix-Transformer and...

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22nd International Conference on Electrical Machines and systems, ICEMS 2019

作者： Xu, Xiaohui Zhang, Yinghui Zhu, Lei Yu, Hu Zhang, Yanfeng Wu, Hongfei Integrated Power System Technology Laboratory Science and Technology on Ship WuHan China Nanjing University of Aeronauticss and Astronautics Nanjing China

ISBN: (纸本)9781728133980

A two-stage high step-down DC-DC converter with matrix-transformer is presented for vehicle power supply applications. Wide voltage gain is achieved by the front-end Boost converter and down-stream phase-shifted full-bridge converter. With the novel two-stage structure, the input voltage range of the down-stream full-bridge converter is narrowed significantly, which helps to reduce the current stress of primary switches and the voltage stress of the secondary switches. Devices with better performances can be chosen and high efficiency power conversion is achieved with the presented topology. Furthermore, the matrix-transformer is used in full-bridge converter to handle the large output current, which is beneficial for simplifying the design and processing of the transformer. Meanwhile, the current sharing of transformer windings will not be considered. Operation principles and characteristics of this converter are analyzed in detail. Experimental results are provided to evaluate the effectiveness of the presented solutions. © 2019 IEEE.

关键词： Vehicles

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Theoretical model of lithium iron phosphate power battery under high-rate discharging for electromagnetic launch

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International Journal of Mechanical system Dynamics 2021年第2期1卷 220-229页

作者： Ren Zhou Junyong Lu Xinlin Long Yiting Wu Lang Liu Yingquan Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhanChina

Due to the large error of the traditional battery theoretical model during large-rate discharge for electromagnetic launch,the Shepherd derivative model considering the factors of the pulse cycle condition,temperature,and life is proposed by the Naval University of *** discharge rate of traditional lithium-ion batteries does not exceed 10C,while that for electromagnetic launch reaches *** continuous pulse cycle condition of ultra-large discharging rate causes many unique electrochemical reactions inside the *** traditional model cannot accurately describe the discharge characteristics of the *** accurate battery theoretical model is an important basis for system efficiency calculation,precise discharge control,and remaining capacity *** this purpose,an experimental platform for electromagnetic launch is built,and discharge characteristics of the battery under different rate,temperature,and life decay are *** the experimental test and analysis,the reason that the traditional model cannot accurately characterize the large-rate discharge process is *** a novel battery theoretical model is designed with the help of genetic algorithm,which is integrated with the electromagnetic launch *** simulation is compared with the experimental results,which verifies the modeling accuracy for the large-rate *** this basis,a variety of discharge conditions are applied to test the applicability of the model,resulting in better ***,with the continuous cycle-pulse condition in the electromagnetic launch system,the stability and accuracy of the model are confirmed.

关键词： battery model electromagnetic launch large-rate discharge lithium iron phosphate battery

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A Data-Driven Open-Circuit Fault Diagnosis Method for Three-Phase T-type Three-level Inverters 3

A Data-Driven Open-Circuit Fault Diagnosis Method for Three-...

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3rd IEEE International power Electronics and Application Conference and Exposition, PEAC 2022

作者： Wang, Yifan Xu, Xiaohui Qiu, Changqing Zheng, Zedong Wang, Kui Li, Yongdong Tsinghua University Department of Electrical Engineering Beijing China Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

This paper presents a data-driven diagnosis method for single-switch open-circuit faults in T-type three-level inverters based on current vector trajectory and convolutional neural network (CNN). First, a simulation model based on T-type topology is built and the three-phase current waveforms under different model parameters are recorded as the dataset. The current vector trajectories are extracted through Clarke transform as the feature (60 × 60). The trajectories are then classified using a convolutional neural network to identify the fault. The method achieved an average validation accuracy rate higher than 99% and is validated through simulation and experiment. It is robust to white noise and changes in model parameters, dc-link voltage, modulation rate, and frequency. © 2022 IEEE.

关键词： Trajectories

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Research on axial length match between stator and rotor of superconducting synchronous motor

Research on axial length match between stator and rotor of s...

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2012 6th International Conference on Electromagnetic Field Problems and Applications, ICEF'2012

作者： Yang, Gao Zheng, Jun Chen, Jin Wuhan Institute of Marine Electric Propulsion Wuhan China Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (纸本)9781467313353

This paper proposes an effective design process for matching axial length between stator and rotor of high temperature superconducting synchronous motor (HTSSM) using two-dimension (2D) finite element method (FEM), magnetic network method (MNM) and three-dimension (3D) finite element method. During this process, 2D FEM is used to get distributional parameter in short time by selecting some representative 2D plane in 3D geometrical space. MNM are more efficient and faster, which is build after accepting some useful conclusion by 2D FEM. 3D FEM is used to makes necessary adjustment, and the result also verify the validity of the former methods, because of its accuracy. The design process is performed in the 1MW HTSSM design for search proper axial length of stator and rotor. The results provide strong direction in different design period, which verify the validity of the method. © 2012 IEEE.

关键词： Stators

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Failure Analysis of power Electronic Devices and Their Applications under Extreme Conditions

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Chinese Journal of Electrical Engineering 2016年第1期2卷 91-100页

作者： Yifei Luo Fei Xiao Bo Wang Binli Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China

power electronic devices are the core components of modern power converters,not only for normal applications,but also for extreme *** design of power electronic devices require large redundancies for *** results in huge volume and weight for a large-capacity power converter,especially for some extreme ***,to optimize the power density,the reliability of power devices needs to be investigated first in order to obtain the accurate operational margin of a power *** much research on device failure analysis has been reported,there still lacks efficient failure evaluation *** paper first summarizes the current failure ***,a three-step failure analysis method of power electronic devices is proposed as:failure information collection,failure identification and mechanism,and failure *** physics-based modeling method is emphasized since it has a strong relationship with the device *** that,power electronic device applications under extreme conditions are introduced and a design method of device under extreme conditions is proposed based on the thermal equilibrium ***,the challenges and prospects to improve the power device reliability under extreme conditions are concluded.

关键词： power electronic device failure mechanism failure evaluation physics-based modeling extreme conditions thermal equilibrium

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Analysis and Design of Wireless power and Information Synchronous Transmission system with Shared Coupling Channel 5

Analysis and Design of Wireless Power and Information Synchr...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Yali, Yang Kai, Ji Bangyin, Liu Yadong, Wang Aoni, Sun Huazhong University of Science and Technology Wuhan China Wuhan Institute of Marine Electric Propulsion Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The technology of wireless power and information synchronous transmission (WPIT) broadens the application scenario of the system. In this paper, the power transmission channel and information transmission channel of WPIT system are modeled and analyzed in detail. Frequency division multiplexing technology is adopted, and different frequency carriers are used for power and information transmission. The composite circuit of power and information transmission is introduced, and the function of each element of the circuit is explained in detail. Furthermore, the methods of signal modulation and demodulation are given. In order to realize the decoupling design of power and information transmission circuit, the crosstalk between power and information carrier is discussed. Then, the channel of power and information transmission are given respectively to analyze the power transmission performance and communication transmission gain. It provides guidance for the parameter design of information transmission circuit. Finally, an experimental prototype is built, with an output power of 200W and a data transmission rate of 200kbps. © 2022 IEEE.

关键词： Inductive power transmission

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Sensorless Control of Permanent Magnet Synchronous Linear Motor Based on Improved Second-Order Generalized Integrators 5

Sensorless Control of Permanent Magnet Synchronous Linear Mo...

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5th Asia Conference on Energy and Electrical Engineering, ACEEE 2022

作者： Kong, Dekang Li, Weichao Han, Jinyang Deng, Chen Yan, Ming Zhou, Liang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China National Key Laboratory of Science and Technology on Vessel Integrated Power System Vessel Integrated Power System Wuhan China

ISBN: (数字)9781665499330

ISBN: (纸本)9781665499330

Band-pass filter (BPF) and low-pass filter (LPF) are generally used to extract the position error signal of permanent magnet synchronous linear motor (PMSLM) in the traditional high-frequency (HF) pulsating voltage injection method. However, filters will generate system delay and affect the dynamic performance of the system. Therefore, this paper proposes to combine the generalized second-order integrator (SOGI) and notch filter (NF) to form an improved generalized second-order integrator (SOGI-NF). This structure effectively reduces the time delay caused by signal processing and shortens the operation time by replacing the BPF. Meanwhile, compared with the traditional SOGI, it has stronger harmonic attenuation ability, wider bandwidth and better dynamic performance. Finally, the feasibility and superiority of the position error signal extraction strategy based on the improved second-order generalized integrator are verified by simulation. © 2022 IEEE.

关键词： Bandpass filters

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Interception probability simulation and analysis of salvo of two electromagnetic coil launched anti-torpedo torpedoes

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Defence technology（防务技术） 2022年第11期18卷 2065-2073页

作者： Bao-qi Wu Guang-sen Wang Xiao-cun Guan Biao Wu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China Jiangsu Automation Research Institute Lianyungang222006China

Electromagnetic coil launch is an important branch of electromagnetic launch(EML)technology,which is suitable for launching anti-torpedo torpedo(ATT).This paper focuses on the EML parameters and the interception probability of the EML two ATTs *** on the launching model of a multi-stage coil launcher,the trajectory model of the ATT and the attacking torpedo,a calculation method for the EML two ATTs salvo parameters is proposed,with the conditions of capture and interception given *** adaptive particle swarm optimization(APSO)algorithm is proposed to calculate the optimal launching parameters,by designing the adaptive inertia weight and time-varying study *** to the analysis of the simulation with Monte Carlo method,EML will improve the interception probability effectively,and the interception probability is affected by the launching *** results demonstrate good performance of the proposed APSO in calculating EML parameters for the two ATTs salvo in certain combat *** of these results are particular regarding the command and decision in the anti-torpedo combat.

关键词： Interception probability Electromagnetic coil launch Anti-torpedo torpedo Adaptive PSO

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